Timing device



April 24, 1951 E. c. WEISKOPF TIMING DEVICE Filed June 28, 1949 INVEN TOR. 50% 0f A/EZSXOPF HYTOMEYS Patented Apr. 24, 1951 UNITED STATES PATENT OFFICE TIMING DEVICE Edwin C. Weiskopf, New York, N. Y.

Application June 28, 1949, Serial No. 101,733

2 Claims. 1

This invention relates to a timing device intended primarily for use with an automatic immersion apparatus of the type disclosed in certain of my U. S. patents, for example, Nos. 2,157,- 8'75 and 2,341,198.

One object of the present invention is the provision of improved means for latching the control lever of the timing device in retracted position at the conclusion of the operations of the apparatus under the control of the timer.

Another object is to simplify the construction of the latching mechanism for the control lever.

The above and other objects, features and advantages of the present invention will be more fully understood from the following description with reference to the accompanying drawings.

In the drawings:

Fig. 1 is a fragmentary front elevation of a timing device embodying the present invention;

Fig. 2 is a fragmentary front elevation of the timing device illustrated in Fig. 1 with the timing disk removed;

Fig. 3 is a rear elevation of the timing device illustrated in Fig. 2;

Fig. 4 is a sectional view of the timing device taken along line 4-4 of Fig. 2;

Fig. 5 is a fragmentary front elevation of part of the timing device illustrated in Fig. 1 showing the position of certain of the parts when the device is operating; and

Fig. 6 is a fragmentary front elevation of part of the timing device illustrated in Fig. 1 showing certain of the parts in another operating position.

Referring to the drawings in detail, the timing device embodying the present invention comprises, as disclosed in my above mentioned patent, a timing disk 10 provided with a'plurality of teeth or projections l2 with intervening notches at its peripheral edge. As described in my Patent No. 2,157,875, disk I0 is preferably formed of cardboard and is removably mounted on a rotary plate [3 driven by a motor 14 which is preferably an electric clock motor, the shaft of which is indicated at [5. Disk [0 is removably clamped to plate l3 by the annular member 16 which is adjustably held in position by a nut ll secured on motor shaft l5. Member 16 is provided with a cam portion 18 which is operable to terminate the operation of the apparatus after the several intermittent operations of the apparatus under the control of disk 10.

The present invention is concerned more particularly with the mechanism, which will now be described, for operating a switch in the circuit which controls the operations of the motor which drives the main shaft of the apparatus, as indicated, for example, in Fig. 10 of my Patent No. 2,341,198 and in the application of Nelson G. Kling, Ser. No. 81,651, filed March 16, 1949, and

assigned to my firm, The Technicon Company.

As shown in Fig. 2, the mechanism comprises a latch member 20 mounted on the frame panel 22 for pivotal movement. More specifically member 20 is fixed to a pin or shaft 24 which has a pivotal bearing in the boss 2| of panel 22. Member 20 is provided with a recessed or grooved portion 26. A yielding means, such as spring 36, is fixed at one end to the latch member 20 and at its other end to panel 22. The switch actuating lever arm 28 is mounted on panel 22 by means of the pivot stud 30 and is provided with an end projection 32 arranged to be engaged by the disk If! during the period of operation of the apparatus and by cam 18, at the end of said period, so that said lever arm is thereafter 'pre vented from being operated even though disk 10 continues to turn during the operation of motor 14. For this purpose lever arm 28 is provided with a transverse pin 34 which enters the notch or recess 26 in latch member 20 when cam I8 engages end 32 of said lever. It will be noted that the pivotally movable stud 30 to which lever 28 is fixed has also fixed thereto an arm 38 (Fig. 3) which is associated with a control switch 40. As here shown, the switch 40 is a micro-switch and has a spring-projected pin 42 which engages arm 38 on stud 30 and tends to turn the latter in a clock-wise direction, viewing Fig. 3, and of course in the opposite direction, viewing Figs. 1, 2, 4 and 6 so that lever 28 is biased toward disk I0 and is held resiliently against the peripheral edge portions of said disk until retracted by cam I8.

Figs. 1 and 2 show lever 28 held in retracted position by the latching device constituted by member 20 and latch pin 34 which engages the latter in recess 26. Assuming that it is desired to start the operation of the apparatus under the control of the timer, latch 20 is manually moved in a clock-wise direction, viewing Figs. 1 and 2, to disengage pin 34 and thereby unlatch lever 28 whereupon the latter is moved by springprojected pin into operative relation with disk I0 as shown in Figs. 4 and 6. The apparatus is thus placed under the control of the timer and switch 40 is actuated at timed intervals in accordance with the arrangement of the projection 12 of disk 10. At the end of one revolution of disk ID in the direction of the arrow in Fig. 1,

cam l8 engages end 32 of lever 28 and moves the latter to a retracted position in which pin 34 is positioned below the upper edge of recess 34 whereupon spring 36 moves latch member 20 into engagement with said pin 34 and holds lever 28 in said retracted position until it is again manually released. It will be noted that as shown by Figs. 4 and 6, pin 34 is positioned in such relation to member 20 and its recess 26 that it is at all times in engagement with edge 44 of member 20, clear of said recess, when moved by disk 10 and cannot be latched in retracted position except by cam I8 or by manual manipulation of the mechanism for latching and unlatching the lever. It will be understood that any suitable normally-open switch may be used instead of the micro-switch 40; however, the latter is conveniently used in the timing device of the present invention since the usual spring-pressed pin 42 with which this type of'switch is provided for opening the switch is available for holding lever 28 in operative relation with timing disk I 0. It will be observed that latching lever 20 is mounted for movement in a plane parallel to the plane of movement of control lever 28 and is positioned so that its edge 44 which is provided with recess 26 engages the transverse projection 34, and that spring 36 is connected to lever 20 between the opposite ends of the latter and is positioned together with the major part of level 20 above lever 28. This general arrangement leaves the lower part of the timer panel clear at the front thereof for mounting various devices.

If necessary an additional spring can be provided for holding lever 28 against the disk l0.

It is to be understood that many changes in the details of construction and in the arrangement of parts may be made without departing from the invention. Accordingly, I do not wish to be limited to the construction herein illustrated or described except to the extent which may be required by the scope of the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent, is:

1. In a timing device operable with a rotary timing disk, with a control lever operable under the control of said disk, and with a retracting device operable to retract said lever from the control of said disk, means for holding said lever in retracted position comprising a latching lever movable in a plane parallel to the plane of movement of said control lever, a projection on said control lever positioned transversely of said planes, said latching lever having a recess in an edge thereof, and a spring connected to said latching lever and normally holding said edge of the latching lever against said projection except when the control lever is retracted by said retracting device and holding said projection in said recess in the retracted position of the control lever.

2. In a timing device operable with a rotary timing disk, with a control lever operable under the control of said disk, and with a retracting device operable to retract said lever from the control of said disk, means for holding said lever in retracted position comprising a latching lever movable in a plane parallel to the plane of movement of said control lever, a projection on said control lever positioned transversely of. said planes, said latching lever having a recess in an edge thereof, and a spring connected to said latching device between the opposite ends of the latter and normally holding said edge of the latching lever against said projection except when the control lever is retracted by said retracting device and holding said projection in said recess in the retracted position of the control lever. I

EDWIN C. WEISKOPF. I

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,287,545 Willard Dec. 10, 1918 2,272,237 Brown et al. Feb. 10, 1942 2,308,037 Abadjieff Jan. 12, 1943 2,335,709 Thumim Nov. 30, 1943 

